| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.flink.playgrounds.ops.clickcount.functions; |
| |
| import org.apache.flink.api.common.functions.MapFunction; |
| import org.apache.flink.playgrounds.ops.clickcount.records.ClickEvent; |
| |
| import java.time.LocalTime; |
| |
| /** |
| * This MapFunction causes severe backpressure during even-numbered minutes. |
| * E.g., from 10:12:00 to 10:12:59 it will only process 10 events/sec, |
| * but from 10:13:00 to 10:13:59 events will pass through unimpeded. |
| */ |
| public class BackpressureMap implements MapFunction<ClickEvent, ClickEvent> { |
| |
| private boolean causeBackpressure() { |
| return ((LocalTime.now().getMinute() % 2) == 0); |
| } |
| |
| @Override |
| public ClickEvent map(ClickEvent event) throws Exception { |
| if (causeBackpressure()) { |
| Thread.sleep(100); |
| } |
| |
| return event; |
| } |
| |
| } |
